Eliminate dependency on git and bash for CloudBioLinux tool shed package installer, use new sh based deployer script in CBL and download tars instead of cloning git.

I hope this addresses Greg Von Kuster comment: "[Galaxy] should generally work in a Bourne shell compatible environment that has Python." Likewise I hope it begins to address James Taylor's desire not to get involved in external version control systems: "Tarballs from *anywhere* are easy enough to deal with. External version control repositories are a bit more challenging, especially when you are pulling just a particular file out, so that's where things got a little hinky for me."

Syntax has been changed so that cbl_repository now should refer to zip or tar file URL (in github or some future tool shed associated blob store). It can still be absent and the CBL master zip will be downloaded from github, likewise a cbl_revision attribute can still be specified to download a specific file - though only from Brad Chapman's CloudBioLinux repository - to download a different revision of CloudBioLinux from a fork simply use the full URL to that zip file.